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Hi, I am so sorry for the late reply. I am using 8 ohms speakers and it's safe using with 4 ohms speakers too, I have tried that on several speakers and it works just fine.
Thanks a lot for your advice. I have lack of knowledge about charging 18650 in series. I know that I could use balance charger. So I have a question. If I have 4in series and I added the PCM control circuit I can charge them with 11.1v or 16.8v ? Thanks.
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